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This may sound funny, but for a while, Yamaha put a steel bolt in the aluminum casing on the side of the motor. dissimilar metals caused extreme corrosion inside that affected operation. Check out Boating forums on Yamaha.
? 2:29 www.youtube.com/watch?v=sMmionreldM Dec 29, 2012 - Uploaded by Peter Richards
Engines for 1989 Larson boat with dual 115 Yamaha 4 StrokeEngines. ... Outboard Yamaha 150 HP DIRTY idle JETS, Motor will not idle .
You have two components for the charging systems. Stator and Rectifier regulator. As a rule of thumb we always change both. First you need to confirm that the outboard is not charging your batteries. use a battery load tester on your batteries confirm you have no dead cells. Second with a fully charged battery, multi-meter, and a water hose connected to your outboard cooling system. third for a picture and diagram of the ignition system go to www.yamaha-motor.com. click on outboard motors,parts and service, view parts catalog. find your year make and model by following steps listed at top. search electrical 1,2,3 until you find a RECTIFIER & REGULATOR ASSY. Click on generator to find the stator. when you find it you will have a picture reference. Check for good ground at the Rect/reg. the stator creates AC voltage the rect/reg converts to DC. rect/reg conects to the battery to charge it through a solenoid on the engine. Connect your multimeter to this solenoid to get the true reading from charging system. start engine check voltage through all rpm ranges. 13.5 v thru 15 v. The other troubleshooting test and disasembly will require a Manual. also to remove the stator you'll have to remove the flywheel.Clymer Service manuals are available through your local outboard dealer. good luck
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